using Rubberduck.Parsing.Abstract;

namespace Rubberduck.Parsing.Expressions;

public sealed class IntLibraryFunctionExpression : Expression
{
    private readonly IExpression _expression;

    public IntLibraryFunctionExpression(IExpression expression)
    {
        _expression = expression;
    }

    public override IValue Evaluate()
    {
        var expr = _expression.Evaluate();
        if (expr == null)
        {
            return null;
        }
        if (expr.ValueType == ValueType.Decimal)
        {
            return new DecimalValue(Math.Truncate(expr.AsDecimal));
        }
        else if (expr.ValueType == ValueType.String)
        {
            return new DecimalValue(Math.Truncate(expr.AsDecimal));
        }
        else if (expr.ValueType == ValueType.Date)
        {
            var truncated = new DecimalValue(Math.Truncate(expr.AsDecimal));
            return new DateValue(truncated.AsDate);
        }
        else
        {
            return new DecimalValue(expr.AsDecimal);
        }
    }
}
